I didn't know cancer has secrets but apparently it does and no one knows what they are (which is why they are called secrets). What is now important is that we know that cancer does have secrets - things we do not yet understand.
In this article (which is very technical and discusses thinks like lincRNA, microRNA and psuedogenes so it requires more than one cup of coffee to completely decipher and leaves me at the end of reading it with the secrets to me start at what the heck are those) discusses some of the progress in deciphering the secrets of cancer and how they are now focusing on 2% of the genome. (Its lots of science and biology so read it if you are ready.)
I think there are lots of secrets involved in cancer. Start with why did I get it? Why can't you make it go away for good? Why do you have to make me so sick in chemo to make me better? And let's end with why can't I get my life back after cancer?
Once they answer those questions and process the important 2%of the genome, maybe they'll have a cure.